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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e3cc6f43ad5eebb4daedd539937e289fe221f6d86db97377385e1997e0ffbc2' 
  AND token = 'aZd4apKeH2OXJhX6DpvB38toz3QCBcgZBZ1Te492jJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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