SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5e6de7a387aa7826f25db7801e46a760eab60c19980f13b8f0dd22f3ecffb11' 
  AND token = 'is/1UAOwV7tgZKn8+1OGX/D3Zn4FZ2egTVf5jAKWlCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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