SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3702db955ce5a59a2433365647d739804c083af5e84d777f94b58ebdf426bce9' 
  AND token = 'qohXGZmYOtnKNbgRB8KFuIts7PB/8ypQUZzXwllWmOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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