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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cc7d2cd2c509514282529bd88af95e0a1dbd308209607d99fe764994a8cc4f4' 
  AND token = 'Ms+cq8S2zwgQaAcsf5b4exzv0A43uo+NPw/EIWMPrbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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