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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1e76a1ac2972113292c668c4cce61d093a1d11162cb5a45a01499a1a36e1ba6' 
  AND token = 'AQzv8McW/7QN0lPvSDigJstS3/DvaH6ZvnrrwfXqYWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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