Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9983b6a755d2dd128fb5b854a0d78e0ec0fce6e22ba5b0fac4cb01b05648ba4e' 
  AND token = 'FCkXz31t947G17Xb2tQU7MP1Wffk6fqP4ptyY6uOBIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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