SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca8f8bc1fadde873dcc52b6e39babf809493d71ba639612b44271bc65b9c32fb' 
  AND token = 'kayNX3CAYjsZRA22pKY5nhCyW5LeuVMT+x99fhLVgSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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