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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '386a6c74f1cc01a14c72c4761963de26a21f015408d6d778f4ff59381d98e78c' 
  AND token = 'F7TQw3xpyeYd3O87Q81ZmJ6+5lbk8k4zMEzaNX5YoLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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