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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e8cd2282bdca636ed2fae611c7b442e7929ebfe39c67fd3e8ce5dcff701f0ac' 
  AND token = 'quvp5RxaMEzLWRww8c0UU+WgJNA64fFLXu2nBbSsYzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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