SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8b7dc3b46e0372c21bac579bd8fbd8cfc6e6ef73304e6322e6dd188cae69f0b' 
  AND token = 'PIqYOklZ6YCosDY1uPuBWZwE0I3d3U8+m/S8AhGHPjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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