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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20583808c9761d60b9c21524567de6febd6b3f606d12768ee4a41466f4acee9d' 
  AND token = 'mh8ki3VzBlmmzy5FtT7cRp0f7cPoHEixhTphaL8xcvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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