SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59bf862ad4af6157b3b927f05f2575656873b491e035af5ae2c9f552714137d9' 
  AND token = 'dE7O6gQhfLLYMucs/G49HbwyApKfNAXHmQds02zSUog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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