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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c91499a5d7deb67c1a9bc92da32d115a54d8c0849b908dcb0fa2d7a05a13202' 
  AND token = '1hY/TOhsuIQQs3ZamE7/YSZAAsqBbFl9SmxFpjNspqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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