SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be46979d647ced66f4dc8c177bf8ffd971e925b222f6b99bb6f77680937ab411' 
  AND token = 'KVJorKwf88UkObu1DdIjhgUPzFyTtF+KjLPZDXgEDRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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