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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e361facfd56b92e1ef9615acbd7a1a42cff842a363b14d05747a6818e7e9a36f' 
  AND token = 'MK8LolWqKf1pYdnrNtUEU6ur7VXW7qFy4sBfXwD0050=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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