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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd275ce1badddd11f7bbe04e1a4ab60cec4dce413e229dd242b4b43d967e9cb0f' 
  AND token = 'UnKv3bEvXrwi91lLvRKGEsQX6qTUVFwbuYjQ39odG3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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