SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00f359f0cef6d34e5875e35ef584864041e4a6a53d693c932aac8218ff7db2e4' 
  AND token = 'Go1EGVNBbexzBcvgIDJmqyvvsbFstKlV04bosDvjuGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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