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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65aab6007923767d1f9b15c92ce53318694e68bcd536e74103c17ab013ee4b63' 
  AND token = 'ff3MnfhBDOwISeGODmxfsxtXs/dHkO7eI1qSLbc2Kq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}