SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b65f3f801ba30477e460b2376f910cd4b1927879ba23c81c7980f45cb6cc22a' 
  AND token = 'hSil7UHv6vZ9IoQBXjdBm2zZ+aCICcvuDqzxsFwp2mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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