SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6da4dd6ebdd095c56cf0839c549bea32c3a911a1617ccb00684f6e8ce3df193' 
  AND token = 'oj9hOUWB+Oj3DJWhzoVTMBzzcIqDQ1LBi4fHILbBZ+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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