SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf24b4c96dd419fd686474f3cbbfca569691ad4acedce51ae7cb4994fc770286' 
  AND token = 'pXMq2iYqUZwHJy71DM3DuIqkgLzGalRZGhbz7wpy8qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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