SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9eb34cb67d9469579cee292a8fc4c5ebbd2a7a061347db150b8da0af0b0a61c7' 
  AND token = 'Htv2qI+OdWluqC8MgBgL/vbZE/vS9Fdng8xhHKXRmRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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