SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce450587f3601355bf86aa3d9888b635be62964a64faa066f743a34e484961c4' 
  AND token = '2rLOGq+QGtyvhpvwoZO8RuF/9zrvQNQ42bO4QpZA+CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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