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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ed3ee5a46c044756f3a06b8f3c6268fce2c6956734ae999268cfb4b9da05675' 
  AND token = 'xFrl/GFyqKTPFyxYGw2o+OsAGUgfAs6de4lNSft8yYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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