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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6591f70c1a16e402f70753b9555df676ca3b2f632e8a2acb6dbaf9d356e13ad' 
  AND token = 'CoarEHv/RIzn4JM6xUKD6UwaV3m/+t8M6ubOM+ipDpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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