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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aab4019080218059bc007c7668f7f12ebebc085f4b6baff8b34a18fbbe054a58' 
  AND token = '7N3XiJ+SwWbgc67a5Daj+40jkXX2B1z5hZKLGVTNlE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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