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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0247daccaad0ece926594d6b09110dff4ce9762724d27f3bdb8328492f4eb3cd' 
  AND token = 'nFhcaoO6MqjdUXdffih3UwH1csXfxkVLKs6nXw0iRAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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