SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ca976fb262753e7056e8a3e534a874ef21d9c94d6719738d9af228dc0355091' 
  AND token = 'Or3l4Au9XD9ClVRyfQaVzG1uQZ/VtXKLC66CIxzDtDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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