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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '147c48614e74a24e5bda10ee38d6ed264b9ed44de338f5c35a35d98aac82ee33' 
  AND token = '4qlTBCFYe9J4zfhc+Ax8oSswDDl7CSqGHhwga3j3fD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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