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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd97310d4e50c58c67f755714162f198bff3e85ee4e2214c858b3a55f1491e3c0' 
  AND token = 'Ky5Dhmo0DncHPMI1igviUsmvlZM1atoUNRmEx/47orA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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