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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b1953e6cff882b3547d6527982b049f2a8c5e435e269b1adb90f5fa43b264ee' 
  AND token = 'QDkP/WsAbAkmS32prjdgtfBJ3me8o4F1LSS4ONDLtO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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