SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adf0a6e8d43ebddd726576b8a34b927af9ab27bd64d542c4c37c73750b73cf99' 
  AND token = 'b9eraQv8oUIRHh3VFgGHsKom9i+vjOFG2mOo+hPHPL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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