SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a08630d8b1cc45586924e56bde38374f4f70f6d4b62cbbe06bfc48d833c443b4' 
  AND token = 'rbZ0yU/+BW+QVY8NaQoLKJN2+wWC+4PNvCtaJyjX0DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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