SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f068dbba9eb18632bd5a12ba9d45ff0a7976cdf20b8b6fc7a401b8999fc38fcf' 
  AND token = 'fLTYmMhkQXLQREDePKIJfvUCoZuKsntUbQjKAu/2pXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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