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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '836ebbf20775954f93d4c76b7c6e78839f978e8ed03800ec38e750c624da97bb' 
  AND token = 'Nk/pxDpOSrhbTVss7nPmPDqquQKmL/ALY6yHnDqH9cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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