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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e94e3ebafcc5b90eaa6fa174f8b02533cf49d085459a652ec54f99d8df27da53' 
  AND token = '0iaYe7VkNXfVj6HTcyqsjd+oqqIGY/MSIt73QMerXrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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