SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8ac5e86c21a0ce2573de0017b38dd41c81ba274b5adcdbeb427d228112021a5' 
  AND token = 'AWe+BL+1TziRztev5SfNKWnUFtZw8mXPjunh2/UHJ9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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