SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '277f9998526d6874eb0c694c19512bda6b11e44c5ecf1a4f595d35f454290a6d' 
  AND token = 'qOhtR8RkjxUofmCTMcqRGWTFFyGhpeu/JYRNY9qQl5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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