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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cabaae614f990a18debb5a8f7c208dc4a020535fac318759eeb3fe7de8cd7df3' 
  AND token = 'IR/QgeKz4kZDInNYK1ao6mUHnolhZDs9yISzG/kfoyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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