SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a25b736e7e4548a6ce273e6ea11862c8c9888132313aa49c0a0d2538fc2d049d' 
  AND token = 'gPjPBCU4wHj5KURcaIztVtJONnt3ZyB0cRIXWkZHllY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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