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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '719c817fa7d5ff677fce31fc6fa06e94e0d3dc11c7350640f2fe9493eae3fd14' 
  AND token = 'Q0rRDua3xGnAjUfHb6bKBJpDzrr7AS0++kEnoCf3bYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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