SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cce408dbb4657782d45900b1a029a63a31357f1b88c63711db60634a26fc7ff' 
  AND token = 'B34Lo2OchX2rHVRjd+BV3s/7dptGYjPhhjVyFRQbpI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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