SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41a977324e60785fca424ea9e31d9906f67c255722e8ef92a16c3f33c03a8270' 
  AND token = 'H8ekhaurS1z4QPwjiLfmGjTviagT5/UWKEDf2YXfPjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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