SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43cc65568d26fec02980c579b2d53291560de0459c3af149a0f487094ab66356' 
  AND token = 'UYWsvXAVv9AUY+MPxCGzMz94T5BGalHV32ADXLIVBNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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