SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '217d0ab464babed7044f5d454f87811734bdbbf9c297915668f15cb63e3438f2' 
  AND token = 'pNUuo70VubksIj0BxH8dhRoJdW3ckDOGMbE0xqyIwKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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