SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cf69c27dadcfc2c32abf1a76ea1b768db7ef4b5fb434f1d597f19e89b4ec700' 
  AND token = 'tmROpAqjJ0LVrYq+yczlG255q7B+lJ7vwQIRVmmPCL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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