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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '828dfca649372130b90e3f08b54f8ca35a979acee35b509e090814caf268ce84' 
  AND token = 'rusPpg5Sn53jtEYidNqBlU7B6KaRMMWVsQG6Kgb9kYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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