SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8148d99cec3c02a29705fac61694bec290f5568ce744d2f7680e953dc53d323' 
  AND token = 'FIa3+B9PQzQ1a3k0zljieEuxzZXbmxKWVECMntXHqp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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