SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '985ea4fd2b8e082f6227063e714c5e9eeb92806f6d57bbb30b27cc962c764302' 
  AND token = 'CRAH3BML+AE4g8D08i5/vPs84wzQ0JHily4BDf/XVTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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