SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f447fcd3186bbd77acf039bd736822d5e23982c762b232559b6a1e1c8d1c7fb' 
  AND token = 'OonabT+c5gD+jJ5jYaVfO9vIW8C/umTj56ofkNqcBr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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