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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be6aeeaf18d20571af9ff0e5dfd9853660fcd16738369a9e97b5b8b134087654' 
  AND token = 'vG12qn5OfWntFP5Zyq7V6Nx0g6JSyoDU3u6i9hDhgW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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