SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '472f6bd145df4c75d1aeff2ebe88f99ae79d833f6348f2d044b235363b33fbca' 
  AND token = 'yFEdppX3sVSUSIY7HZTVqfuLoPhZQYqyYoJfXNJweCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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