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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35bbaa7e81cc6d57e38fdaf77654b82473b332db3b19440dda104069fc72d776' 
  AND token = 'bSIb7xjs3BRYwWrLtGok7CT3/IJh7NNDADOFsOxqlak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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