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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b16b0ecf0c94e313fe562dd7818e92d37d3821d9be6e0cab62300ce4f92426b' 
  AND token = 'N02yMu6pcHFaadMVTihDBTmcrvLy2fea4GsiJU183sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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