SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e80104f9696105861c6a844e90536d2c4cfda9beb745da3aacd56273b83ba25' 
  AND token = 'S4GGOhkXQ3PGxhiI5jE7/vfHtwpDCNRAUstmyKahKtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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