Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd30c29d0453fc3a990933fc5c18525203f0ad63d09b9406504b1929fb6189497' 
  AND token = 'relj7TgHPRG+3inMury4IoOL9iOMvY0v3IDfv6bTwGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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