SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3380266cfa9df2bb48aa169aaa02db946151d8915891f013d0237a52e47f204a' 
  AND token = 'YcEqXZr1K0xFjnhK8K/13fGDvs4mKhn5K4fpfOG7Ghw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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