SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61b679d6280e3eedc54edf2afcfd7f62254707fe948880cef698616758865b08' 
  AND token = 'JaeG7s0zEksVsA3AVIjN0YKwWaZG3FBdU1B5B3LCuTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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