SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd93f32e5f8aeb188636fd6960a38dafe48336b9f9615a27dda4813fb3560c69f' 
  AND token = 'PBKfBJagWmvXwgA7zY0g88I1NSrS8YVICM4gonoMhVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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