SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd8cd9202a26428f5a05968c15953fa0539280b628e98561b0bb9eba53d5770c' 
  AND token = 'qzqsgm4EqYt2+2HEkU7/XReGio/uMJEbJLmAZdagcjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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